6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dan Williams <dan.j.williams@xxxxxxxxx> [ Upstream commit 5d09c63f11f083707b60c8ea0bb420651c47740f ] Dan reports that cxl_decoder_commit() potentially leaks a hold of cxl_dpa_rwsem. The potential error case is a "should not" happen scenario, turn it into a "can not" happen scenario by adding the error check to cxl_port_setup_targets() where other setting validation occurs. Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Closes: http://lore.kernel.org/r/63295673-5d63-4919-b851-3b06d48734c0@moroto.mountain Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx> Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx> Fixes: 176baefb2eb5 ("cxl/hdm: Commit decoder state to hardware") Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/cxl/core/hdm.c | 19 ++----------------- drivers/cxl/core/region.c | 8 ++++++++ 2 files changed, 10 insertions(+), 17 deletions(-) diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index 3ad0d39d3d3fa..64e86b786db52 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -575,17 +575,11 @@ static void cxld_set_type(struct cxl_decoder *cxld, u32 *ctrl) CXL_HDM_DECODER0_CTRL_HOSTONLY); } -static int cxlsd_set_targets(struct cxl_switch_decoder *cxlsd, u64 *tgt) +static void cxlsd_set_targets(struct cxl_switch_decoder *cxlsd, u64 *tgt) { struct cxl_dport **t = &cxlsd->target[0]; int ways = cxlsd->cxld.interleave_ways; - if (dev_WARN_ONCE(&cxlsd->cxld.dev, - ways > 8 || ways > cxlsd->nr_targets, - "ways: %d overflows targets: %d\n", ways, - cxlsd->nr_targets)) - return -ENXIO; - *tgt = FIELD_PREP(GENMASK(7, 0), t[0]->port_id); if (ways > 1) *tgt |= FIELD_PREP(GENMASK(15, 8), t[1]->port_id); @@ -601,8 +595,6 @@ static int cxlsd_set_targets(struct cxl_switch_decoder *cxlsd, u64 *tgt) *tgt |= FIELD_PREP(GENMASK_ULL(55, 48), t[6]->port_id); if (ways > 7) *tgt |= FIELD_PREP(GENMASK_ULL(63, 56), t[7]->port_id); - - return 0; } /* @@ -689,13 +681,7 @@ static int cxl_decoder_commit(struct cxl_decoder *cxld) void __iomem *tl_lo = hdm + CXL_HDM_DECODER0_TL_LOW(id); u64 targets; - rc = cxlsd_set_targets(cxlsd, &targets); - if (rc) { - dev_dbg(&port->dev, "%s: target configuration error\n", - dev_name(&cxld->dev)); - goto err; - } - + cxlsd_set_targets(cxlsd, &targets); writel(upper_32_bits(targets), tl_hi); writel(lower_32_bits(targets), tl_lo); } else { @@ -713,7 +699,6 @@ static int cxl_decoder_commit(struct cxl_decoder *cxld) port->commit_end++; rc = cxld_await_commit(hdm, cxld->id); -err: if (rc) { dev_dbg(&port->dev, "%s: error %d committing decoder\n", dev_name(&cxld->dev), rc); diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index d1f513800c10d..85c0881fba442 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -1189,6 +1189,14 @@ static int cxl_port_setup_targets(struct cxl_port *port, return rc; } + if (iw > 8 || iw > cxlsd->nr_targets) { + dev_dbg(&cxlr->dev, + "%s:%s:%s: ways: %d overflows targets: %d\n", + dev_name(port->uport_dev), dev_name(&port->dev), + dev_name(&cxld->dev), iw, cxlsd->nr_targets); + return -ENXIO; + } + if (test_bit(CXL_REGION_F_AUTO, &cxlr->flags)) { if (cxld->interleave_ways != iw || cxld->interleave_granularity != ig || -- 2.42.0
